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ASTM C1942-24

(Practice)

Standard Practice for Evaluation of Low Angle Light Characteristics

Standard Practice for Evaluation of Low Angle Light Characteristics

SIGNIFICANCE AND USE
4.1 Some tile surfaces may exhibit variations under low angle conditions as part of the designed aesthetic.  
4.2 This practice is intended for tiles that are designed to have an overall uniform appearance under low angle conditions.
SCOPE
1.1 This practice replicates low angle viewing conditions on ceramic tile installations.  
1.2 The values stated in inch-pound units are to be regarded as the standard. The values in parentheses are for information only.  
1.3 This qualitative practice is intended to provide general guidance at the manufacturing level to determine if product will be acceptable under typical end use conditions.  
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

Status
Published
Publication Date
31-Jan-2024
Technical Committee
C21 - Ceramic Whitewares and Related Products
Drafting Committee
C21.06 - Ceramic Tile
Current Stage
Ref Project

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ASTM C1942-24 - Standard Practice for Evaluation of Low Angle Light CharacteristicsASTM C1942-24 - Standard Practice for Evaluation of Low Angle Light Characteristics
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ASTM C1942-24 - Standard Practice for Evaluation of Low Angle Light Characteristics
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This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: C1942 − 24
Standard Practice for
1
Evaluation of Low Angle Light Characteristics
This standard is issued under the fixed designation C1942; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 3.1.2 low angle light defect, n—a visual difference between
tiles, or within a tile, that is outside of the products intended
1.1 This practice replicates low angle viewing conditions on
aesthetic at lower angles (less than 45°).
ceramic tile installations.
3.1.2.1 Discussion—When viewed at near vertical condi-
1.2 The values stated in inch-pound units are to be regarded
tions (60° to 90°) the defect is typically not detectable. On
as the standard. The values in parentheses are for information
lower gloss tiles this can be a checkerboard pattern (gloss
only.
difference) from tile to tile as shown by Fig. 1. Higher gloss
(polished) tiles may exhibit specific defects under these con-
1.3 This qualitative practice is intended to provide general
ditions as described in Terminology F109.
guidance at the manufacturing level to determine if product
will be acceptable under typical end use conditions.
4. Significance and Use
1.4 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the 4.1 Some tile surfaces may exhibit variations under low
responsibility of the user of this standard to establish appro-
angle conditions as part of the designed aesthetic.
priate safety, health, and environmental practices and deter-
4.2 This practice is intended for tiles that are designed to
mine the applicability of regulatory limitations prior to use.
have an overall uniform appearance under low angle condi-
1.5 This international standard was developed in accor-
tions.
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
5. Apparatus
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
5.1 Any viewing box that controls the lighting conditions
Barriers to Trade (TBT) Committee. and fixes the visible angle available to the evaluator.
5.2 The box shall be wide enough to accommodate at least
2. Referenced Documents
two tiles being viewed, so length and width may vary. An
2
2.1 ASTM Standards: opening of 6.0 in. 6 1.0 in. (127 mm to 177.8 mm) that per-
F109 Terminology Relating to Surface Imperfections on
mits viewing of the product without directly observing the light
Ceramics source. An example is provided as Fig. 2.
5.3 The light source shall be placed a minimum of 12 in.
3. Terminology
behind the rear edge of the tile in relation to the front of the
3.1 Definitions:
box.
3.1.1 low angle light conditions, n—conditions of where a
5.4 Light Source, of sufficient strength to cast a strong
horizontal surface is back lit and the viewing angle is very
diffused, light across the samples from the rear of the box. An
shallow with respect to the light source. Typically less than
18W LED 24 in. fixture with 1350 lm and a color temperature
45°.
of 5000 K was found to be sufficient for a 50 in. by 60 in. by
6 in. box shown in Fig. 2.
1
This practice is under the jurisdiction of ASTM Committee C21 on Ceramic
6. Test Specimens
Whitewares and Related Products and is the direct responsibility of Subcommittee
C21.06 on Ceramic Tile.
6.1 At least two tile specimens shall be selected at random
Current edition approved Feb. 1, 2024. Published February 2024. DOI: 10.1520/
from the lot to be tested.
C1942–24.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
6.2 Shall be of the type that are intended by the manufac-
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
turer to exhibit little to no variation under these viewing
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. conditions.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
C1942 − 24
FIG. 1 Low Angle Light Defect Visible in an Installation
7.3 Clean tiles with a clean microfiber cloth to remove any
dust.
7.4 Viewing distance shall be far enough to view entire
array at an angle of 10° to 30° from the tile surface. Typically
a range of 36 in. to 60 in. This is represented by Fig. 3.
7.5 Viewing Time, 60 s per array or 6 s per squa
...

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